43812138 has 16 divisors (see below), whose sum is σ = 92236320. Its totient is φ = 13835376.

The previous prime is 43812137. The next prime is 43812151. The reversal of 43812138 is 83121834.

It is a super-2 number, since 2×43812138² = 3839006872262088, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (43812137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 192045 + ... + 192272.

It is an arithmetic number, because the mean of its divisors is an integer number (5764770).

Almost surely, 2^43812138 is an apocalyptic number.

43812138 is an abundant number, since it is smaller than the sum of its proper divisors (48424182).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

43812138 is a wasteful number, since it uses less digits than its factorization.

43812138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384341.

The product of its digits is 4608, while the sum is 30.

The square root of 43812138 is about 6619.0738022778. The cubic root of 43812138 is about 352.5316786580.

The spelling of 43812138 in words is "forty-three million, eight hundred twelve thousand, one hundred thirty-eight".